Package com.google.appengine.api.datastore

Interface CallbackContext<T>

Type Parameters:
T - the type of element that the callback is acting on.
All Known Implementing Classes:
DeleteContext, PostLoadContext, PreGetContext, PreQueryContext, PutContext
public interface CallbackContext<T>
Describes the context in which a callback runs. The context has access to the current transaction (if any), the element that the callback is operating on (eg the Entity being put or the Key being deleted), as well as all elements being operated on in the operation that triggered the callback..

  • Method Summary

    Modifier and Type
    Method
    Description
    T
    getCurrentElement()
    Returns the element for which the callback has been invoked.
    int
    getCurrentIndex()
    Returns the index in the result of getElements() of the element for which the callback has been invoked.
    Transaction
    getCurrentTransaction()
    Returns the current transaction, or null if there is no current transaction.
    List<T>
    getElements()
    Returns an unmodifiable view of the elements involved in the operation that triggered the callback..

  • Method Details

    • getElements

      List<T> getElements()
      Returns an unmodifiable view of the elements involved in the operation that triggered the callback..

    • getCurrentTransaction

      Transaction getCurrentTransaction()
      Returns the current transaction, or null if there is no current transaction.

    • getCurrentIndex

      int getCurrentIndex()
      Returns the index in the result of getElements() of the element for which the callback has been invoked.

    • getCurrentElement

      T getCurrentElement()
      Returns the element for which the callback has been invoked. Shortcut for getElements().getCurrentIndex().